Wideband antenna and wireless communication device

Abstract

A wideband antenna includes a first radiator formed as a part of a metal frame for resonating a first signal component of a radio-frequency signal, a second radiator disposed within an area enclosed by the metal frame for resonating a second signal component of the radio-frequency signal, and a feed terminal electrically connected between the second radiator and a ground for feeding the radio-frequency signal, wherein there is a distance between the first and second radiators such that a coupling effect is induced between the first and second radiators, which allows the first signal component being fed from the second radiator into the first radiator via the coupling effect.

What is claimed is: 
     
       1. A wideband antenna, comprising:
 a first radiator formed as a part of a metal frame for resonating a first signal component of a radio-frequency signal; 
 a second radiator disposed within an area enclosed by the metal frame for resonating a second signal component of the radio-frequency signal, comprising:
 a first arm electrically connected to a feed terminal and extending from the feed terminal along a first direction; and 
 a second arm having one end electrically connected to the first arm, another end opened, and extending along a second direction, wherein the first direction is perpendicular to the second direction; 
 
 a first parasitic radiator comprising:
 a third arm electrically connected to a ground and extending from the ground along the first direction, wherein the first arm is disposed between the third arm and the first radiator; and 
 a fourth arm having one end electrically connected to the third arm, another end opened, and extending from the third arm along the second direction, and disposed between the third arm and the second arm; 
 
 a second parasitic radiator electrically connected to the ground, extending from the ground along the first direction, and disposed between the first arm and the first radiator; and 
 the feed terminal electrically connected to the second radiator for feeding the radio-frequency signal; 
 wherein there is a distance between the first and second radiators such that a coupling effect is induced between the first and second radiators, which allows the first signal component being fed from the second radiator into the first radiator via the coupling effect. 
 
     
     
       2. The wideband antenna of  claim 1 , wherein an end of the first radiator is electrically connected to a first ground terminal, and another end of the first radiator is electrically connected to a second ground terminal, wherein the first radiator is coupled to the ground via the first and second ground terminals. 
     
     
       3. The wideband antenna of  claim 1 , which is a coupled-fed loop antenna. 
     
     
       4. A wireless communication device, comprising:
 a metal frame; 
 an antenna comprising:
 a first radiator formed as a part of the metal frame for resonating a first signal component of a radio-frequency signal; 
 a second radiator disposed within an area enclosed by the metal frame for resonating a second signal component of the radio-frequency signal, comprising:
 a first arm electrically connected to a feed terminal and extending from the feed terminal along a first direction; and 
 a second arm having one end electrically connected to the first arm, another end opened, and extending along a second direction, wherein the first direction is perpendicular to the second direction; 
 
 a first parasitic radiator comprising:
 a third arm electrically connected to a ground and extending from the ground along the first direction, wherein the first arm is disposed between the third arm and the first radiator; and 
 a fourth arm having one end electrically connected to the third arm, another end opened, and extending from the third arm along the second direction, and disposed between the third arm and the second arm; 
 
 a second parasitic radiator electrically connected to the ground, extending from the ground along the first direction, and disposed between the first arm and the first radiator; and 
 the feed terminal electrically connected to the second radiator for feeding the radio-frequency signal; 
 
 wherein there is a distance between the first and second radiators such that a coupling effect is induced between the first and second radiators, which allows the first signal component being fed from the second radiator into the first radiator via the coupling effect. 
 
     
     
       5. The wireless communication device of  claim 4 , wherein an end of the first radiator is electrically connected to a first ground terminal, and another end of the first radiator is electrically connected to a second ground terminal, wherein the first radiator is coupled to the ground via the first and second ground terminals. 
     
     
       6. The wireless communication device of  claim 4 , wherein the antenna is a coupled-fed loop antenna.